When talking about Green Bay and surrounds, and ethnic whites in the same sentence, you MUST make reference to the ethnic group that makes Green Bay unique. Walloons.
They voted Democratic pretty hard in 1916.
Brown County has quite an elevated share of people with Belgian ancestry (11% in the 2000 census, no distinction made there between Walloon and Flemish). However, the far dominating ancestry group is German (38.4%). Wikipedia lists Green Bay as number four US city as concerns German ancestry (after Dubuque IA, Fargo, and Madison).